An enclosed biosphere; a pod-like greenhouse attached to a space-going vessel.

These spaces, or devices, could be easily moved. They could be hung in places to take advantage of space or sunlight.

He puffed heavily as he angled around the bulbous lifezones - huge bubbles extruded from the sleek lines of the Argo, like immense, bruised bodies of parasites. Inside, their opalescent walls ran with dewdrops, shimmering moist jewels hanging a bare finger's width away from hard vacuum. Green fronds pressed here and there against the stretched walls - a sight which at first had terrified him, until he understood that somehow the rubbery yet glassy stuff could take the pokes and presses of living matter without splitting.

This approach can be contrasted with the use of large hydroponics farms, which have a more industrial flavor to them. The lifezones are themselves of a lifelike form, rather than looking like a factory.